User manual

welcome contents
installation
operation
rter
inormation
16
Num
Lock
Caps
Lock
Scroll
Lock
Num
Lock
Caps
Lock
Scroll
Lock
Num
Lock
Caps
Lock
Scroll
Lock
Note: If the screen goes blank during adjustment, either press the opposite
arrow key to the one you last pressed or press to reset all delays.
c Press to save the setting and return to standby.
Alternatively, press to discard any change and return to standby.
To exit video compensation mode (return to normal operation)
1 Ensure that you are at standby level by exiting from any adjustment options.
2 On the remote unit, return the miniature switch 1 to its OFF position.
All USB devices will be reconnected to the computer and normal operation
will continue.
To adjust colour skew
You will only need to use these adjustments if the video image is not sharp after
adjusting the cable type and length. Before entering video compensation mode,
display the suggested screen content (see Test images while compensating in
the box right). Look for colour fringes adjacent to the displayed icons and text.
Also check the Adder test pattern generator image to confirm whether the red,
green and blue crosses are all vertically aligned.
a From standby, press either , or depending on which colour needs
to be adjusted. The Num Lock, Caps Lock or Scroll Lock
indicators will flash for the Red, Green and Blue channels
respectively.
b Use and to adjust the delay for the
chosen colour while watching the results
on the remote video display.
The Adder
test pattern
generator
showing its RGB
crosses. In this case,
the green signal can be
seen out of line with the other
two colours.
What is skew and why is compensation needed?
The twisted pair cabling supported by the X-USBPRO modules consists of four
pairs of wires per cable, three of which are used to convey red, green and blue
video signals to the remote video display. Due to the slight difference in twist rate
between these three pairs, the red, green and blue video signals may not arrive
at precisely the correct times. This is visible as separate colour shadows on high
contrast screen images. This effect is particularly apparent when using higher
screen resolutions and some types of category 5e cables.
The video compensation system within the remote module allows you to delay
or advance the timing of any of the colour signals so that they all arrive at the
display at the correct times.
Take a close look at a locally connected display. From left to right, groups of
pixels are usually arranged in the order: R / G / B and the signals must arrive in
the correct order to obtain the optimum screen image. The Adder test pattern
generator (see box below) in particular helps to highlight the pixel layout by
showing very narrow horizontal and vertical lines.
To obtain and run the free Adder test pattern generator
1 Visit www.adder.com.
2 Click the PRODUCTS heading and then choose Management Software.
3 From the list of software utilities, choose the ADDER Test Pattern
Generator option.
4 Click the Downloads tab and choose the ADDER Test Pattern Generator
option to download the utility.
5 Unzip the downloaded file and run the TESTpatterns.exe file.
6 Click the SKEW option.
Test images while compensating
For best results while adjusting video
compensation, arrange a combination of
elements on the remote display. We suggest
the following:
• Roughlyhalfofthescreentodisplay
standard operating system colour icons on
a mid-green wallpaper.
• AquarterscreenoftheAddertestpattern
generator.
• Aquarterscreenofstandardblacktextonawhitebackground.
Note: You need to set all of the above BEFORE entering video compensation
mode because the USB keyboard will be isolated from the computer.